Cup & RatioSpecialty Coffee Reference Matrices & Client-Side Calculators
Cup & Ratio provides two comprehensive technical reference workbenches for baristas, home brewers, and coffee roasters. Both tools render their complete lookup tables directly in server-rendered static HTML and run all interactive Extraction Yield (EY%), bypass dilution, water remineralization, and sensory defect filtering calculations 100% locally in your browser.
Static HTML Matrix + Local Calculator
Coffee Extraction Yield (EY%), TDS & Flavor Defect Diagnostic Compass
Compute percolation and immersion Extraction Yield (EY%) with Retained Liquid Ratio (LRR) correction, bypass dilution, and diagnose 16 sensory faults—from sour/salty under-extraction to tannic channeling and high-bicarbonate chalkiness.
Static HTML Matrix + Local Calculator
Specialty Coffee Water Mineral (GH / KH Alkalinity) & Brew Method Grind Micron Matrix
Reference SCA target water mineral ranges (Ca²⁺, Mg²⁺, GH 50–175 ppm, KH 40–75 ppm as CaCO₃), calculate DIY Epsom salt and sodium/potassium bicarbonate concentrates, and look up D50 grind micron targets from 150 µm Ibrik to 1,100 µm Cold Brew.
Which coffee engineering workbench should I open first?
| Your Brewing or Quality-Control Task | Recommended Workbench | What It Computes & Diagnoses |
|---|---|---|
1. Calculating true Extraction Yield (EY%) from a refractometer TDS% reading across V60 pour-over, espresso, French press, or AeroPress | Extraction Yield (EY%), TDS & Flavor Defect Compass | Applies the exact percolation vs. immersion mass-balance equation with Retained Liquid Ratio (LRR) correction and computes post-brew bypass water dilution targets. |
| 2. Diagnosing a sour, salty, hollow, astringent, bitter, or flat/chalky cup and deciding whether to adjust grind microns, water temperature, or ratio | Extraction Yield (EY%), TDS & Flavor Defect Compass | Filters 16 specific sensory defects across the SCA Brewing Control Chart, mapping each fault to its physical mass-transfer cause and step-by-step recipe adjustment. |
3. Formulating DIY remineralized brewing water from distilled/RO water using Epsom salt (MgSO4·7H2O) and baking soda (NaHCO3) or potassium bicarbonate (KHCO3) | Water Mineral (GH / KH Alkalinity) & Grind Micron Matrix | Converts elemental ion weights into ppm as CaCO3, solves gram-level stock concentrate and direct-addition recipes, and evaluates espresso boiler Langelier Saturation Index (LSI). |
4. Matching median grind particle size (D50 microns), brew ratio, water temperature, and contact time across 12 specialty brewing methods | Water Mineral (GH / KH Alkalinity) & Grind Micron Matrix | Tabulates target D50 micron ranges from 150 µm Ibrik and 250 µm Espresso to 550 µm V60, 750 µm Chemex, and 1,100 µm Cold Brew alongside unimodal vs. bimodal span notes. |
Why we combine full static HTML tables with local JavaScript calculators
Whether you are dialing in a morning espresso shot or mixing a 4-liter jug of remineralized pour-over water, core reference constants—such as the SCA water quality target table, molar conversion factors for `CaCO3` equivalents, and the 16-row sensory defect compass—should be visible and printable immediately without clicking through multi-step wizards. Read more about our verification workflow in our editorial policy.